Specifies the name of a collating sequence in the default NCS
    library, SYS$LIBRARY:NCS$LIBRARY, or in the NCS library specified
    by the argument library-name. (In most cases, it is probably
    simplest to make the sequence-name the same as the ncs-name: for
    example, COLLATING_SEQUENCE IS FRENCH FRENCH.) You can view the
    collating sequence names by using the command NCS/LIST at DCL
    level.

    The collating sequence can be either one of the pre-defined NCS
    collating sequences or one that you have defined yourself using
    NCS.